I don't think the event should be cancelled or postponed
In past years I have attended ... there has been rain, sun , snow, sleet, wind, bugs, cold, high water levels, low water levels ...but the event has never been cancelled.
Not sure what club members expect or want out of this event. We used to run our clinics in-house. It's an intermediate river which is just right for the novice/intermediate ... if you want to up the level, paddle the section backwards.
Unfortunately the club's weekend competes with the Ottawa Race weekend, Great glebe garage sale and a myriad of other activities. But I thought this was a paddling club.